[BUGFIX] Disable Upgade Wizard "Version Compatibility" when up to date

The Version Compatibility always appears at the first place and tells
you that you should upgrade your compatVersion or that everything is
okay, but you might.. if you really really want this.. in case of, don't
know, whatever reason.. downgrad again.

Remove this ugly thing. compat_version can still be changed again using
"All configuration".

Change-Id: Ie45a50ab20a0c8d59021362e45b7bed743e43199
Resolves: #24834
Releases: 4.6
Reviewed-on: http://review.typo3.org/5038
Reviewed-by: Jigal van Hemert
Tested-by: Jigal van Hemert
Reviewed-by: Helmut Hummel
Tested-by: Helmut Hummel

typo3/sysext/install/updates/class.tx_coreupdates_compatversion.php

@@ -42,49 +42,7 @@ class tx_coreupdates_compatversion extends Tx_Install_Updates_Base {
 	function checkForUpdate(&$description)	{
 		global $TYPO3_CONF_VARS;
 
-		if ($this->compatVersionIsCurrent())	{
-			$description = '
-				<p>
-					<strong>Up to date!</strong>
-					<br />
-					If you do not use the wizard, your current TYPO3
-					installation is configured to use all the features included
-					in the current release ' . TYPO3_version . '.
-					<br />
-					There are two possibilities that you see this screen:
-				</p>
-				<ol>
-					<li>
-						<strong>You just updated from a previous version of
-						TYPO3:</strong>
-						Because of some new features, the frontend output of
-						your site might have changed. To emulate the "old"
-						frontend behavior, change the compatibility version
-						by continuing to step 2.
-						This is <strong>recommended</strong> after every update
-						to make sure the frontend output is not altered. When
-						re-running the wizard, you will see the changes needed
-						for using the new features.
-						<em>Please continue to step two.</em>
-					</li>
-					<li>
-						<strong>You just made a fresh install of TYPO3:</strong>
-						Perfect! All new features will be used.
-						<em>You can stop here and do not need this wizard now.</em>
-					</li>
-				</ol>
-			';
-
-			if (!$TYPO3_CONF_VARS['SYS']['compat_version'])	{
-				$description .= '
-					<p>
-						The compatibility version has been set to the current
-						TYPO3 version. This is a stamp and has no impact for
-						your installation.
-					</p>
-				';
-			}
-		} else {
+		if (!$this->compatVersionIsCurrent()) {
 			$description = '
 				<p>
 					Your current TYPO3 installation is configured to
@@ -100,9 +58,10 @@ class tx_coreupdates_compatversion extends Tx_Install_Updates_Base {
 					features.
 				</p>
 			';
+			return 1;
 		}
 
-		return 1;	// Return 1 in any case so user has possibility to switch back to a previous compat_version.
+		return 0;
 	}
 
 	/**